Python Deque 模块使用详解-Python Tutorial-php.cn

创建Deque序列:

from collections import deque

d = deque()

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Deque提供了类似list的操作方法:

  d = deque()
  d.append('1')
  d.append('2')
  d.append('3')
  len(d)
  d[0]
  d[-1]

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输出结果:

  3
  '1'
  '3'

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两端都使用pop:

  d = deque('12345')
  len(d)
  d.popleft()
  d.pop()
  d

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输出结果:

  5
  '1'
  '5'
  deque(['2', '3', '4'])

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我们还可以限制deque的长度:

d = deque(maxlen=30)

当限制长度的deque增加超过限制数的项时, 另一边的项会自动删除:

  d = deque(maxlen=2)
  d.append(1)
  d.append(2)
  d
  d.append(3)
  d
  deque([1, 2], maxlen=2)
  deque([2, 3], maxlen=2)

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添加list中各项到deque中:

  d = deque([1,2,3,4,5])
  d.extendleft([0])
  d.extend([6,7,8])
  d

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输出结果:

  deque([0, 1, 2, 3, 4, 5, 6, 7, 8])

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Related labels：

deque python

source：php.cn

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